Fatal error: Uncaught Error: Interface "Symfony\Component\CssSelector\Parser\ParserInterface" not found in /home/slsiluser/public_html/service-portal-mobile-responsive/vendor/symfony/css-selector/Parser/Parser.php:28 Stack trace: #0 {main} thrown in /home/slsiluser/public_html/service-portal-mobile-responsive/vendor/symfony/css-selector/Parser/Parser.php on line 28